In restorative dentistry, the ability of the dentist to accurately determine the color of the teeth and to communicate it clearly to the dental technician has a great impact on the aesthetics of the final restoration. Next, we can share together the knowledge about tooth colorimetry. Teeth become darker, which means that the brightness of the teeth gradually decreases. The teeth become darker, which means that the teeth become progressively more saturated in color. We all know the concept of the three primary colors, in aesthetics, red, yellow and blue are defined as the three most basic colors, and the different colors we see with the naked eye are formed by mixing these three primary colors in different proportions. In this picture, from left to right, the primary colors of the teeth change from blue, gradually to yellow and red. This means that the composition of the various primary colors of the tooth changes, i.e., the hue changes. In summary, we can learn that the three elements of a tooth’s color are: brightness, saturation, and hue. So how do we determine the color of a tooth? Scientists find out the various possible colors of human natural teeth in the color space, and get such a long shuttle-shaped, similar to the “banana” three-dimensional space. Similarly, we put the traditional VITA 16 color linear colorimetric plate in the color space to find out the colors, we can see that the 16 colors in the tooth color space is not very neatly arranged, some places are more concentrated, some places are very sparse, and even 2 colors are located outside the tooth color space. It can be seen that the traditional 16 colorimetric plate has its limitations. Now, VITA has introduced the 3D-MASTER colorimetric plate: it divides the sample teeth into five areas according to their brightness, and in each area, the saturation increases gradually from top to bottom, where in the three areas 2, 3 and 4, the left column is more yellowish and the right column is more reddish. The shades indicated by the VITA3D-MASTER palette are well arranged and evenly distributed in the tooth color space and include almost all the colors of natural teeth. The main step in using the VITA3D-MASTER palette is to first select the correct brightness group. Each group includes a central sample denture, which is quickly compared to the teeth in order of increasing brightness in a contrasting manner, and any incorrect brightness comparisons are then virtually eliminated. The next step was to determine the saturation within that group. First, compare the teeth in the mouth with the central sample of the chosen luminance group, M2. It is necessary to decide whether the color is darker (higher saturation) or lighter (lower saturation). In the final step, we compare the four samples around 2M2 with the teeth to determine whether the teeth are a little more yellow, or a little more red,? This accurately determines the color of the teeth. and can be accurately expressed to the technician.